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Do we have to learn esql in order to use EF?

Posted By:      Posted Date: October 12, 2010    Points: 0   Category :ASP.Net

I've just finish readding overview of EF  : http://msdn.microsoft.com/en-us/library/Aa697427 

And, I find that although we are freed from using sql, but EF bring in esql that we have to use to query entities.

Is it a must to use esql, can we use linq instead to do the same as esql does?

If it's a must, how long will it take to learn enough

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